Table 11: M320 Router Major Hardware Components
Offline
Button
Field-
ReplaceableRedundantFunctionQuantityComponent
—Hot-pluggable—Provides ports for external management
and alarm relay devices; includes an
electrostatic discharge (ESD) point
1Connector Interface
Panel (CIP)
YesHot-pluggable
(if not
redundant)
YesMonitors and controls router components
(requires a Routing Engine)
1–2Control Board
—Hot-removable,
Hot insertable
YesCools router components2 front
fan trays,
1 rear fan
tray
Cooling system
—Hot-removable.
hot-insertable
—Displays status and provides an interface
for controlling router functions
1Craft interface
YesHot-removable,
hot-insertable
—Connect PICs to other router components,
contain Packet Forwarding Engines
(supports FPC1, FPC2, and FPC3)
1–8FPCs
—Hot-pluggableYesConsists of a Routing Engine and Control
Board and provides routing and system
management functions
1–2Host subsystem
YesHot-removable,
hot-insertable
—Provide an interface to various network
media
1–4 per
FPC
PICs
—Hot-removable,
hot-insertable
YesDistributes needed voltages to router
components
2Power supply (DC only)
Reset
button
Hot-pluggable
(if not
redundant)
YesProvides routing functions and routing
tables (requires a Control Board)
1–2Routing Engine
YesHot-removable,
hot-insertable
YesProvide switching function to the
destination FPC
4SIBs
Field-replaceable units (FRUs) are router components that can be replaced at the
customer site. Replacing FRUs requires minimal router downtime. There are three types
of FRUs:
•
Hot-removable and hot-insertable—You can remove and replace the component
without powering down the router or interrupting the routing functions.
•
Hot-pluggable—You can remove the component without powering down the router,
but routing functions are interrupted until the replacement is installed.
•
Requires router shutdown—You must power down the router before removing the
component.
25Copyright © 2012, Juniper Networks, Inc.
Chapter 1: M Series Multiservice Edge Routers
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